The National Longitudinal Study of Adolescent Health data were used to test predictions from life history theory. We hypothesized that (1) in young adulthood an emerging life history strategy would exist as a common factor underlying many life history traits (e.g., health, relationship stability, economic success), (2) both environmental harshness and unpredictability would account for unique v...

The present study was undertaken to develop superior hybrids for yield and its component traits in Sesamum indicum L. through interspecific hybridization by utilizing S. malabaricum as one of the parents. Direct reciprocal crosses were attempted using eight cultivated varieties malabaricum, which evaluated a total fifteen hybrids. Highly significant positive heterosis observed few vegetative tr...

Identification and discrimination of most cranberry varieties is problematic. There are few qualitative morphological traits with which to discriminate varieties of cranberry. Apple varieties, on the other hand, are easily discriminated, i.e. the fruit of Golden Delicious versus Red Delicious apples. Vegetative morphology, e.g. leaf shape, size, etc., of most cranberry varieties is very similar...

Drought affects the growth and development of rice from direct seeding or transplanting to maturity in northern China. It is important carry out QTL mapping for drought tolerance improve breeding. In this study, a RIL population consisting 253 families was constructed by crossing Miyang 23 with Jileng 1. The leaf rolling index (LRI), withering degree (LWD) chlorophyll content (LCC) were measure...

Polyploidization plays an important role in species formation as chromosome doubling results in strong reproductive isolation between derivative and parental taxa. In this note I describe a new species, Mimulus peregrinus (Phrymaceae), which represents the first recorded instance of a new British polyploid species of Mimulus (2n = 6x = 92) that has arisen since the introduction of this genus in...

Resource allocation to different functions is central in life-history theory. Plasticity of functional traits allows clonal plants to regulate their resource allocation to meet changing environments. In this study, biomass allocation traits of clonal plants were categorized into absolute biomass for vegetative growth vs. for reproduction, and their relative ratios based on a data set including ...

Understanding the genetic basis of complex quantitative traits is a central problem in evolutionary biology, particularly for traits that may lead to adaptations in natural populations. The annual and perennial ecotypes of Mimulus guttatus provide an excellent experimental system for characterizing the genetic components of population divergence. The 2 life history ecotypes coexist throughout t...

The aim of present study was to evaluate the effects of drought stress on net photosynthesis rate (Pn), stomatal resistance, water use efficiency (WUE) and biomass (BM) of six maize (Zea mays L.) hybrids. Drought stress applied by withholding water supply at 4-5 leaf stage (S1, vegetative stage), anthesis (S2, reproductive stage), and dual stress condition (S3, combination of vegetative and rep...